The Roman Catholic Church is the largest denomination with over 1 billion members, comprising over half of all Christians worldwide making it the largest denomination for any religion worldwide. Protestant denominations comprise roughly 38-39% of Christians worldwide, and together the Catholics, Protestants, Anglicans, and other closely related denominations comprise Western Christianity. Eastern Orthodoxy, largely Greek and Russian, Oriental Orthodoxy, Saint Thomas Churches (India) and the Assyrian Church of the East are considered Eastern Christianity. Western Christian denominations prevail in Europe and its former colonies. Eastern Christian denominations are represented mostly in Eastern Europe (including all of Russia), and the Near East.

I see where the question is coming from though. Down here for some reason people get really offended if you say Catholicism is Christian. Apparently these crazy ass evangelists down here want nothing to do w/ Catholicism and try to cast it off as the devils religion or something.